What is the right ascension and declination for star A?

What is the right ascension of a star?

right ascension, in astronomy, the east–west coordinate by which the position of a celestial body is ordinarily measured; more precisely, it is the angular distance of a body's hour circle east of the vernal equinox, measured along the celestial equator. … The symbol for right ascension is the Greek letter α (alpha).

How do you find right ascension and declination?

0:314:29Right Ascension and Declination Basics – YouTubeYouTubeStart of suggested clipEnd of suggested clipLong if you're looking west you'll notice that the everything seems to be going down. And if we'reMoreLong if you're looking west you'll notice that the everything seems to be going down. And if we're looking east.

How do you find the declination of a star?

The declination of the star is measured from the celestial equator, and so the transit altitude of our star is given by 90-Φ+δ. The star will be due south when it transits.

What is declination in astronomy?

declination, in astronomy, the angular distance of a body north or south of the celestial equator. … North declination is considered positive and south, negative. Thus, +90° declination marks the north celestial pole, 0° the celestial equator, and -90° the south celestial pole.

What is the declination and right ascension of the north celestial pole?

The declination of the north celestial pole is 90° 0' 0" and the south celestial pole's declination is -90° 0' 0". The equator is 0° 0' 0". The position of an object is stated with the right ascension first, then the declination. For example, the bright star Sirius' position is RA: 6h45m8.

What is RA and DEC in astronomy?

R.A. means “right ascension” and Dec. means “declination”; these are the two parts of the equatorial coordinate system. Astronomers developed it to correspond to longitude and latitude on Earth.

How do you convert RA to degrees?

For Right Ascension, astronomers always use the convention of Hours:Minutes:Seconds. There are 24 hours of RA around a circle in the sky, because it takes 24 hours for the Sun to move all the way from sunrise to the next sunrise. Thus, 1 hour of RA equals 15 degrees of RA.

What is the right ascension and declination of the autumnal equinox?

EQUINOXES AND SOLSTICES